Coupled dark energy with perturbed Hubble expansion rate

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	Coupled dark energy with perturbed Hubble expansion rate
	Yang, WQ ; Xu, LX
刊名	PHYSICAL REVIEW D
	2014
卷号	90 期号:8 页码:83532
关键词	OSCILLATION SPECTROSCOPIC SURVEY BARYON ACOUSTIC-OSCILLATIONS INTERACTING QUINTESSENCE REDSHIFT-SPACE GROWTH-RATE MODELS MATTER CONSTRAINTS GALAXIES PERTURBATIONS
ISSN号	1550-7998
通讯作者	Yang, WQ (reprint author), Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China.
英文摘要	The coupling between dark sectors provides a possible approach to mitigate the coincidence problem of the cosmological standard model. In this paper, dark energy is treated as a fluid with a constant equation of state, whose coupling with dark matter is proportional the Hubble parameter and energy density of dark energy, that is, (Q) over bar = 3 xi(x)(H) over bar(rho) over bar (x). In particular, we consider the Hubble expansion rate to be perturbed in the perturbation evolutions of dark sectors. Using joint data sets which include cosmic microwave background radiation, baryon acoustic oscillation, type Ia supernovae, and redshift-space distortions, we perform a full Markov chain Monte Carlo likelihood analysis for the coupled model. The results show that the mean value with errors of the interaction rate is xi(x) = 0.00305(-0.00305-0.00305-0.00305)(+0.000645+0.00511+0.00854) for Q(A)(mu)parallel to u(c)(mu) and xi(x) = 0.00317(-0.00317-0.00317-0.00317)(+0.000628+0.00547+0.00929) for Q(A)(mu)parallel to u(x)(mu), which means that the recent cosmic observations favor a small interaction rate which is up to the order of 10(-3). Moreover, in contrast to the coupled model with an unperturbed expansion rate, we find the perturbed Hubble expansion rate can bring about a negligible impact on the model parameter space.
学科主题	Physics
收录类别	SCI
资助信息	NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01]
原文出处	http://dx.doi.org/10.1103/PhysRevD.90.083532
语种	英语
WOS记录号	WOS:000350215700001
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15599]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Yang, WQ,Xu, LX. Coupled dark energy with perturbed Hubble expansion rate[J]. PHYSICAL REVIEW D,2014,90(8):83532.
APA	Yang, WQ,&Xu, LX.(2014).Coupled dark energy with perturbed Hubble expansion rate.PHYSICAL REVIEW D,90(8),83532.
MLA	Yang, WQ,et al."Coupled dark energy with perturbed Hubble expansion rate".PHYSICAL REVIEW D 90.8(2014):83532.